Integrated aftertreatment system

Abstract

The utility model provides an integrated post-processing system, including casing and the heat exchanger of being located the outside of casing, the upper part area of inside chamber is provided with catalytic converter, the lower part area of inside chamber is provided with silencer, the casing sets up the intake pipe and several tail pipes, the intake pipe with catalytic converter's import intercommunication, the outlet of catalytic converter is connected with the inlet of silencer through heat exchanger, the outlet of silencer is connected with the tail pipe. The utility model discloses an integrated post-processing system, the catalytic converter is integrated to the muffler, through structure reinforcement and increase passive valve to increase low frequency / high frequency noise noise reduction amount and restrain the vibration of muffler shell, thereby effectively reducing the noise, and through the heat exchanger of carrying effectively reducing tail pipe outlet gas temperature, preventing scalding passenger, thereby optimizing space utilization, providing greater space for battery pack.

Description

Technical Field

[0001] This utility model belongs to the field of exhaust gas treatment technology, specifically relating to an integrated after-treatment system. Background Technology

[0002] With increasingly stringent domestic automotive noise regulations, the noise levels for exhaust systems are becoming more and more demanding. However, under the conditions of energy conservation, environmental protection, and lightweight design, exhaust systems still need to meet legal and regulatory requirements. The goal is to add muffler components within a limited space to meet noise requirements, while minimizing the cost and materials used in the muffler device.

[0003] Hybrid vehicles require a large battery pack to be installed in the chassis, which occupies a significant amount of chassis space. This reduces the space available for the exhaust system's muffler, posing a considerable challenge to the acoustic design of the exhaust system. Integrated aftertreatment system designs improve exhaust efficiency and reduce noise by shortening the exhaust path and reducing connecting components. This integrated design reduces the number of parts, lowers manufacturing and maintenance costs, and achieves energy recovery through heat exchangers, contributing to the goal of "dual carbon" emissions reduction. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides an integrated after-treatment system that can simultaneously solve problems related to space, noise, high temperature of the tailpipe, and vibration durability.

[0005] To solve the above-mentioned technical problems, this utility model provides an integrated after-treatment system, the main features of which are: a shell and a heat exchanger located outside the shell; a catalyst is arranged in the upper part of the inner cavity; a muffler is arranged in the lower part of the inner cavity; the shell is provided with an air inlet pipe and several tail pipes; the air inlet pipe is connected to the inlet of the catalyst; the outlet of the catalyst is connected to the inlet of the muffler through the heat exchanger; and the outlet of the muffler is connected to the tail pipes.

[0006] Preferably, the inner cavity is provided with a first partition and a second partition parallel to and spaced apart from the first partition. Both the first and second partitions extend from top to bottom, and the first and second partitions sequentially divide the inner cavity into a first partition chamber, a second partition chamber, and a third partition chamber. The inlet of the catalyst is located in the first partition chamber, and the outlet of the catalyst is located in the third partition chamber. A third partition extending laterally is provided between the first and second partitions, and the third partition divides the second partition chamber into an upper compartment and a lower compartment. The silencer includes: A connecting pipe extends through the second partition into the lower compartment and the third partition chamber. One end of the connecting pipe is connected to the heat exchanger, and the other end of the connecting pipe is a closed end. At least one section of the connecting pipe located in the lower compartment is provided with a first vent hole, through which gas enters the lower compartment. A U-shaped tube extends through the first and second partitions, with one end of the U-shaped tube positioned in the first partition cavity and the other end connected to the first tail pipe. A passive valve is provided on the third partition. A second vent is provided on the portion of the first partition corresponding to the upper compartment. Gas in the lower compartment enters the upper compartment through the passive valve, then enters the first partition cavity through the second vent and exits through the U-shaped tube. At least one straight pipe passes through the first or second partition, one end of the straight pipe is located in the lower compartment, and the other end of the straight pipe is connected to the second tail pipe, through which the gas in the lower compartment is discharged.

[0007] Preferably, a fourth partition is provided between the second partition and the inner wall of the shell to divide the third partition cavity into upper and lower chambers. The outlet of the catalyst is located in the upper chamber, and a third vent is provided in the portion of the connecting pipe located in the lower chamber. The second partition is provided with a fourth vent corresponding to the portion of the lower chamber.

[0008] Preferably, the catalyst outlet is an open outlet, and the heat exchanger inlet is connected to the upper chamber.

[0009] Preferably, the U-shaped tube includes a first U-shaped tube and a second U-shaped tube, with the other end of the first U-shaped tube located in the first partition cavity and the other end of the second U-shaped tube located in the third partition cavity.

[0010] Preferably, the bent portion of the first U-shaped tube is located in the third partition cavity, and the bent portion of the second U-shaped tube is located in the first partition cavity.

[0011] Preferably, the straight pipe includes a first straight pipe and a second straight pipe, the other end of the first straight pipe is connected to the corresponding second tail pipe through the first partition cavity, and the other end of the second straight pipe is connected to the corresponding second tail pipe through the third partition cavity.

[0012] Preferably, at least one of the first tailpipe and the second tailpipe is equipped with an active valve; The first partition plate is provided with a fifth air hole corresponding to the lower compartment.

[0013] Preferably, the intake pipe has a flexible joint.

[0014] Preferably, the housing is provided with a strap support.

[0015] This utility model's integrated aftertreatment system integrates the catalytic converter into the muffler. By strengthening the structure and adding passive valves, it increases the noise reduction of low-frequency / high-frequency noise and suppresses the vibration of the muffler housing, thereby effectively reducing noise. Furthermore, by incorporating a heat exchanger, it effectively reduces the exhaust temperature of the tailpipe, preventing burns to passengers. This optimizes space utilization and provides more space for the battery pack. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the external structure of the integrated post-processing system of this utility model.

[0017] Figures 2 to 7 These are schematic diagrams of the internal structure of the integrated post-processing system of this utility model from different perspectives.

[0018] Figure 8 This is a cross-sectional view of the integrated post-processing system of this utility model.

[0019] Figure 9 A to Figure 9 Figure D shows the acoustic test results of the tailpipe of the integrated after-treatment system of this utility model. Detailed Implementation

[0020] To make the technical problem solved by this utility model clearer, the present utility model will be further described below with reference to embodiments and accompanying drawings. The specific embodiments described herein are for illustrative purposes only and are not intended to limit the present utility model.

[0021] like Figures 1 to 8 The diagram shows an embodiment of the integrated aftertreatment system of this utility model. The integrated aftertreatment system includes a housing 1 with an inner cavity and a heat exchanger 4 located outside the housing 1. A catalyst 9 is disposed in the upper part of the inner cavity, and the catalyst 9 is laterally encapsulated in the upper part of the inner cavity. A muffler is disposed in the lower part of the inner cavity. The housing 1 is provided with a strap support 5, an intake pipe 3, and four tailpipes. The intake pipe 3 is connected to the inlet of the catalyst 9. The outlet 10 of the catalyst 9 is connected to the inlet of the muffler through the heat exchanger 4. The outlet of the muffler is connected to the tailpipes.

[0022] The intake pipe 3 has a flexible section 2, which can disconnect the vibration transmission of the engine; at the same time, the housing 1 can enhance and reduce radiated noise. Based on the integrated aftertreatment system of this utility model, by integrating the catalytic converter 9 and the muffler together, space can be saved, solving the problem of small chassis space in hybrid vehicles; the heat exchanger can reduce the tailpipe temperature, preventing burns to passengers and reducing exhaust noise; the flexible section 2 decouples from the strap bracket 5, which can effectively reduce the vibration amplitude, thereby simultaneously solving problems such as space, noise, tailpipe high temperature, and vibration durability.

[0023] like Figures 2 to 8 As shown, the inner cavity is provided with a first partition 30 and a second partition 31 parallel to and spaced apart from the first partition 30. Both the first partition 30 and the second partition 31 extend from top to bottom, and the first partition 30 and the second partition 31 sequentially divide the inner cavity into a first partition cavity 11, a second partition cavity 12, and a third partition cavity 13. The inlet of the catalyst 9 is located in the first partition cavity 11, and the outlet 10 of the catalyst 9 is located in the third partition cavity 13. Figure 2 As shown, the inner cavity consists of a first partition cavity 11, a second partition cavity 12, and a third partition cavity 13 from left to right. A third partition 15 extending laterally is disposed between the first partition 30 and the second partition 31, dividing the second partition cavity 12 into an upper compartment and a lower compartment.

[0024] In this embodiment, the silencer includes: Connecting pipe 23 extends through the second partition 31 into the lower compartment and the third partition cavity 13, with one end of the connecting pipe 23 connected to the heat exchanger 4, such as... Figure 5 As shown, the other end of the connecting pipe 23 is a closed end, and at least the section of the connecting pipe 23 located in the lower compartment is provided with a first vent 24, through which gas enters the lower compartment. A U-shaped tube extends through the first partition 30 and the second partition 31. One end of the U-shaped tube is located in the first partition cavity 11, and the other end of the U-shaped tube is connected to the first tail tube 8.

[0025] In this embodiment, the U-shaped tube includes a first U-shaped tube 22 and a second U-shaped tube 19, as shown below. Figure 3 and Figure 5 As shown, the other end of the first U-shaped tube 22 is located in the first partition cavity 11, and the other end of the second U-shaped tube is located in the third partition cavity 13. An air vent 20 is provided in the portion of the second U-shaped tube 19 located in the lower compartment.

[0026] Specifically, such as Figure 4As shown, the bent portion 27 of the first U-shaped tube 22 is located in the third partition cavity 13, as... Figure 5 As shown, the bent portion 28 of the second U-shaped tube 19 is located in the first partition cavity 11.

[0027] like Figure 2 and Figure 3 As shown, the third partition 15 is equipped with a passive valve 16, and the first partition 30 is equipped with a second vent 21 corresponding to the upper compartment. The gas in the lower compartment enters the upper compartment through the passive valve 16, and then enters the first partition chamber 11 through the second vent 21 before being discharged silently from the first U-shaped tube and the second U-shaped tube.

[0028] The silencer includes: Two straight pipes pass through the first partition 30 or the second partition 31, with one end of the straight pipe located in the lower compartment and the other end of the straight pipe connected to the second tail pipe 7.

[0029] Specifically, such as Figure 2 As shown, the straight pipe includes a first straight pipe 17 and a second straight pipe 18. The other end of the first straight pipe 17 is connected to the corresponding second tail pipe 7 through the first partition cavity 11, and the other end of the second straight pipe 18 is connected to the corresponding second tail pipe 7 through the third partition cavity 13. In this embodiment, an active valve 6 is provided in the second tail pipe 7.

[0030] When the active valve 6 is open, the gas in the lower compartment can be discharged through the two straight pipes. When the active valve 6 is closed, the gas in the lower compartment can be discharged through the passive valve 16 and the two U-shaped pipes.

[0031] like Figure 2 As shown, a fourth partition 14 is provided between the second partition 31 and the inner wall of the shell 1 to divide the third partition cavity 13 into upper and lower chambers. The outlet 10 of the catalyst 9 is located in the upper chamber. The portion of the connecting pipe 23 located in the lower chamber is provided with a third vent 25. The portion of the second partition 31 corresponding to the lower chamber is provided with a fourth vent 26. The gas cooled by the heat exchanger can enter the lower chamber through the third vent 25 and the fourth vent 26, and then be discharged through the lower chamber with silence.

[0032] like Figure 2 As shown, the outlet 10 of the catalyst 9 is an open outlet, and the inlet of the heat exchanger 4 is connected to the upper chamber. The open outlet of the catalyst facilitates the reduction of volume, vibration reduction, and assembly.

[0033] The first partition 30 is provided with a fifth air hole 29 corresponding to the lower compartment.

[0034] The above-mentioned silencer based on this utility model can improve acoustic performance. Figure 9 A to Figure 9 The D display shows the acoustic test results of the tailpipe. The test tailpipe is the first tailpipe 8 located on the side of the first partition cavity. The test was conducted on the engine bench and in a semi-anechoic chamber. The sampling position was 500mm away from the tailpipe at a 45° angle. The test tailpipe was tested under WOT operating conditions. The test method refers to the OEM standard.

[0035] Figure 9 A to Figure 9 D represents the total noise, second-order noise, fourth-order noise, and sixth-order noise of the tailpipe, respectively. The black line represents the target line, the green line represents the test results of this product, and the blue line represents the test results of a conventional exhaust system. The acoustic test results show that this product meets the acoustic targets.

[0036] This utility model's integrated aftertreatment system integrates the catalytic converter into the muffler. By strengthening the structure and adding passive valves, it increases the noise reduction of low-frequency / high-frequency noise and suppresses the vibration of the muffler housing, thereby effectively reducing noise. Furthermore, by incorporating a heat exchanger, it effectively reduces the exhaust temperature of the tailpipe, preventing burns to passengers. This optimizes space utilization and provides more space for the battery pack.

[0037] The above descriptions are specific embodiments of this utility model and do not constitute a limitation on the scope of protection of this utility model. Any modifications and variations made to the technical concept of this utility model should be included within the scope of protection of this utility model.

Claims

1. An integrated aftertreatment system, characterized by, The device includes a shell with an inner cavity and a heat exchanger located outside the shell. A catalyst is disposed in the upper part of the inner cavity, and a muffler is disposed in the lower part of the inner cavity. The shell is provided with an intake pipe and several tailpipes. The intake pipe is connected to the inlet of the catalyst. The outlet of the catalyst is connected to the inlet of the muffler through the heat exchanger. The outlet of the muffler is connected to the tailpipes.

2. The integrated aftertreatment system of claim 1, wherein, The inner cavity is provided with a first partition and a second partition parallel to and spaced apart from the first partition. Both the first and second partitions extend from top to bottom, and the first and second partitions sequentially divide the inner cavity into a first partition chamber, a second partition chamber, and a third partition chamber. The inlet of the catalyst is located in the first partition chamber, and the outlet of the catalyst is located in the third partition chamber. A third partition extending laterally is provided between the first and second partitions, and the third partition divides the second partition chamber into an upper compartment and a lower compartment. The silencer includes: A connecting pipe extends through the second partition into the lower compartment and the third partition chamber. One end of the connecting pipe is connected to the heat exchanger, and the other end of the connecting pipe is a closed end. At least one section of the connecting pipe located in the lower compartment is provided with a first vent hole, through which gas enters the lower compartment. A U-shaped tube extends through the first and second partitions, with one end of the U-shaped tube positioned in the first partition cavity and the other end connected to the first tail pipe. A passive valve is provided on the third partition. A second vent is provided on the portion of the first partition corresponding to the upper compartment. Gas in the lower compartment enters the upper compartment through the passive valve, then enters the first partition cavity through the second vent and exits through the U-shaped tube. At least one straight pipe passes through the first or second partition, one end of the straight pipe is located in the lower compartment, and the other end of the straight pipe is connected to the second tail pipe, through which the gas in the lower compartment is discharged.

3. The integrated aftertreatment system of claim 2, wherein, A fourth partition is provided between the second partition and the inner wall of the shell to divide the third partition cavity into upper and lower chambers. The outlet of the catalyst is located in the upper chamber. A third vent is provided in the part of the connecting pipe located in the lower chamber. A fourth vent is provided in the part of the second partition corresponding to the lower chamber.

4. The integrated aftertreatment system of claim 3, wherein, The catalyst outlet is an open outlet, and the heat exchanger inlet is connected to the upper chamber.

5. The integrated aftertreatment system of claim 2, wherein, The U-shaped tube includes a first U-shaped tube and a second U-shaped tube, with the other end of the first U-shaped tube located in the first partition cavity and the other end of the second U-shaped tube located in the third partition cavity.

6. The integrated aftertreatment system of claim 5, wherein, The bent portion of the first U-shaped tube is located in the third partition cavity, and the bent portion of the second U-shaped tube is located in the first partition cavity.

7. The integrated aftertreatment system of claim 2, wherein, The straight pipe includes a first straight pipe and a second straight pipe. The other end of the first straight pipe is connected to the corresponding second tail pipe through the first partition cavity, and the other end of the second straight pipe is connected to the corresponding second tail pipe through the third partition cavity.

8. The integrated aftertreatment system of claim 2, wherein, At least one of the first tailpipe and the second tailpipe is equipped with an active valve; The first partition plate is provided with a fifth air hole corresponding to the lower compartment.

9. The integrated aftertreatment system of claim 1, wherein, The intake pipe has a flexible joint.

10. The integrated aftertreatment system of claim 1, wherein, The housing is equipped with a strap bracket.

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